Austin's Winchester Cathedral is a pure white sport of Mary Rose. Yours looks to be different, more of a blush color, and less full than WC. I'd keep an eye on it, and if the next blooms on those branches are the lighter color, you might want to propagate some.

my Mary rose also does some blush blooms. I never have paid attention to see if all them come from the same cane. Gorgeous rose Hoang Ton! Your roses are all amazing.